Tool retaining means

ABSTRACT

A holder for a mineral mining cutter pick having a shank arranged for receipt in a socket in the holder, wherein the holder has a latch comprising a loop member arranged to surround a tool shank in the holder, and at least one resilient member e.g. of rubber co-operating with a part of the loop member to urge the loop member into engagement with the tool shank to resist removal of the shank from the socket.

United States Patent [1 1 Proctor 1 TO OL RETAINING MEANS [75] lnventor:Sidney E. Proctor, High Wycombe,

England [73] Assignee: Austin Roy and Company Limited, High Wycombe,Buckinghamshire, England [22] Filed: Sept. 3, 1971 [21] Appl. No.2177,645

Related US. Application Data [63] Continuation-impart of Ser. No.l8,477,-March 11, 1970, abandoned. v

[30] Foreign Application Priority Data Sept. 11, 1970 Great Britain43,678/70 [52] U.S. Cl 299/92, 3 7/142 A, 85/8.8, v 279/24 [51] Int. Cl.E2lc 25/46 [58] Field of Search 279/24, 29, 1 Q;

. [451 Aug. -7, 1973 [56] v References Cited UNITED STATES PATENTS3,622,206 11/1971 Krekeler 299/92 FOREIGN PATENTS OR APPLICATIONS1,086,264 10/1967 Great Britain 299/92 Priniary Examiner-Ernest R.Purser Attorney-Rupert J. Brady et al.

[57] ABSTRACT A holder for a mineral mining cutter pick having a shankarranged for receipt in a socket in the holder, wherein the holder has alatch comprising a loop member arranged to surround a tool shank in theholder, and at least one resilient member eg of rubber cooperating witha part of the loop member to urge the loop member into engagement withthe tool shank to resist removal of the shank from the socket.

16 Claims, 21 Drawing Figures PAIENIEU 11w 3.151.113

SHEET 3 [IF 4 1 TOOL RETAINING MEANS This application is acontinuation-in-part of my copending application Ser. No. 18,477, filedMar. 11,1970, for TOOL RETAINING MEANS and now abandoned.

The invention relates to a holder for mounting a shanked tool and moreparticularly, but not exclusively, to a holder having a socket forreceiving a shanked cutter tool for use in a mineral mining machine.

According to the invention there is provided a holder having a socketfor receiving a shanked tool, the holder having a resilient latch forretaining the shank in the socket, the latch comprising a member havingparts disposed on opposite sides of the socket and connected by anintermediate portion or portions, at least one of which partsresiliently biases an opposite part towards and to lie at least partlyin the socket, whereby on inserting a shank into the socket saidopposite part engages the shank so as to retain it in the socket.

Preferably, resilient means is disposed between the firstsaid part ofthe latch member and the holder.

The latch member preferably comprises an endless member mounted tosurround a shank in the socket.

Preferably the endless member is disposed in a recess formed in the wallof the socket and surrounding the socket. In one construction the recessis in the form of a slot extending through the holder from one side tothe other. The slot may be disposed normal to the longitudinal axis ofthe socket or may be at an angle thereto. The resilient member may beof'elastomeric material and is preferably arranged to surround a portionof the endless member. The resilient member is preferably disposed in acavity in the holder.

The invention also provides a body defining a socket and adapted toreceive a resilient latch for use in the combination defined above. I

The invention further provides a resilient latch adapted to be used in aholder as set out above.

The invention is diagrammatically illustrated by way of example ,in theaccompanying drawings in which:

FIG. 1 is a side elevation of a first embodiment of holder in accordancewith the invention;

FIG. 2 is a sectional elevation of the holder of FIG. 1, taken on theline B B of FIG. 1 and with a latch mounted therein;

FIG. 3 is an-end elevation in the direction of arrow A of FIG. 1;

FIGS. 4a and 4b are respectively a plan view, and a sectional elevationon the line C C of FIG. 4a through part of a resilient latch for use inthe holder shown in FIGS. 1 to 3;

FIGS. 5a and 5b show respectively a side elevation and end elevation ofa further part of the resilient'latch shown in FIGS. 4d and 4b;

FIG. 6 shows a shanked cutter tool suitable for use in a holder as shownin FIGS. 1 to 3;

FIG. 7 is an end elevation of a second embodiment of holder inaccordance with the invention;

FIG. 8 is a sectional side elevation on the line D D of FIG. 7;

FIG. 9 is a plan view of the holder shown in FIGS. 7 and 8; I

FIG. 10 is a side elevation of a third embodiment of holder inaccordance with the invention;

FIG. 11 is a plan view of the holder shown in FIG. l0;

FIG. 12 is a sectional side elevation on the line E E of FIG. 11 andwith a latch mounted therein;

FIG. 13 is a side elevation of a latch suitable for use in theholder-shown in FIGS. 10 to 12;

FIG. 14 is a plan view of the latch shown in FIG. 13;

FIG. 15 is a plan view of a modified latch suitable for use with theholders shown in FIGS. 1 to 3 or 7 to 9;

FIG. 16 is a section on the line F F of FIG. 15, and

FIGS. 17 to 19 are respectively a side elevation, a cross-sectional planview and a cross-sectional side elevation of a further modifiedarrangement.

Referring to FIGS. 1 to 6 of the drawings a holder for a coal cutterpick comprises a block 1 formed with a rectangular socket 2 extendingtherethrough from its upper to its lower surface. Midway between theupper and lower surfaces of the block a transverse slot 3 extends fromone side of the block to the other and intersects the socket 2. Toassist in the machining of the slot, a hole 18 is first bored throughthe block. At one end the block is formed with a generally cylindricalrecess 4 which communicates with the socket 2 via the slot 3.

A substantially rectangular endless member 5 is disposed loosely in theslot 3 so as to surround the socket 2 but with an end portion 6 thereofextending into the socket. An end portion 7 of the member 5 opposite theend portion 6 is mounted in a resilient bush 8 (preferably of neoprene)which is a tight fit in recess 4. Intermediate portions or limbs 13connect the end portions of the member 5. The resilient bush 8 isgenerally cylindrical in shape and is formed with a diametricallydisposed bore 9 arranged to receive the portion 7 of the endless member5. In addition the sides of the resilient bush are relieved at 10 toreceive the intermediate portions 13 of the endless member. Theresilient bush is also formed with a slot I l communicating with thebore 9, which slot can be distended to permit insertion of an endlessmember into the resilient bush. Alternatively the bush may be bonded ormoulded round the endless member. The endless member 5 and the resilientbush 8 forms a latch by means of which a pick 12 can be resilientlyretained in the holder.

As shown in FIG. 6 the coal cutter pick 12 is formed with a hard cuttertip 13 and with a shank portion 14 which is arranged to be receivedwithin the socket 2 of the holder 1, shoulders 15 on the cutter picklimiting movement of the pick into the socket. The shank 14 is formedwith a recess 16 and is chamfered at 17 for the purposes to be describedbelow.

In use, a coal cutter pick is inserted into the socket in the holderuntil the chamfered end of the shank engages the portion 6 of theendless member and displaces the portion 6 of the endless member fromthe socket by compressing the resilient bush 8 so that the cutter pickcan be fully inserted into the socket. When the shank is fully insertedthe portion 6 becomes aligned with the recess 16 in the shank of thetool and thus snaps into the recess under the action of the resilientbush. In this manner removal of the cutter pick from the holder ishindered.

Accidental removal of the pick is also-hindered by reason that a forcetending to remove the pick from the holder will cause the endless memberto ride up the inclined face of the recess 16 until the upper surface ofthe endless member contacts the underside of the slot 3, thus creating awedging action resisting further movement of the tool.

Referring now to FIGS. 7 to 9 of the drawings there is shown a pickholder 1 which is generally similar to that described above with theexception that the slot 3 is closed at the sides of the holder andinstead extends through the holder from end to end. The holder isarranged to receive an endless member and a resilient bush 8, forexample of the kind shown in FIGS. 4 and 5 of the drawings.

FIGS. to 14 of the drawings illustrate a modified form of holder andresilient latch in which the slot 3 extends through the holder from sideto side and in which the recess 4 also extends through the holder fromside to side. The slot 3 is disposed at a shallow angle (e.g. 10) to thenormal to the axis of the socket 2. The inclined slot 3 enhances thewedging effect (referred to above) which occurs when a force tends toremove a pick from the socket.

In this embodiment the resilient latch comprising the endless member 5and the resilient bush 8 is inserted into the holder sideways ratherthan endways as is the case in the arrangement described above. As canbe seen in FIGS. 13 and 14 the endless member 5 is trapezoidal in shapeand the resilient bush 8 is generally similar in construction to thatillustrated in FIG. 5 except that the bush substantially whollysurrounds a part of each limb or intermediate portion 13 of the endlessmember.

In FIGS. 15 and 16 there is shown a modified form of resilient latchwhich may be used in place of the latch described in FIGS. 4 and 5 ofthe drawings. As best seen in FIG. 15 the elastomeric bush 8 issandwiched between steel end plates l2. It has been found that the endplates 12 have the effect of imparting to the latch a more positiveaction by preventing undue and uncontrolled distortion of the bush.

In FIGS. 17 to 19 of the drawings there is shown a coal cutter pickholder arrangement generally similar to those described above. Theholder 1 is formed with a pair of transverse recesses 4 extendingthere-through, the recesses being positioned one at each side of thesocket 2. A slot 3 extends through the holder from one side to the otherso as to intersect the socket 2 and to join the recesses 4. A pair ofoppositely disposed projections 24 extending laterally of the holder arearranged in the vicinity of the slot 3.

The resilient latch 5 comprises a generally rectangular closed loop ofmetal, the opposite ends of which carry resilient bushes 8. The bushes 8are cylindrical in form and are moulded onto the loop. The end 6 of theloop carries an oppositely disposed pair of fingers 23.

The latch is arranged to be disposed in the slot 3 to surround thesocket in the holder, the resilient bushes 8 being disposed one in eachof the recesses 4. The end 6 of the latch projects into the socket toform a detent for retaining the tool 12 in the holder, and the fingers23 project from the sides of the holder.

When it is desired to insert a tool in the holder and/or remove a tooltherefrom, a lever is engaged between the projections 24 and the fingers23 and the latch is moved in the direction of the arrow B (FIG. 18) tocompress the bushes 8, so as to remove the end 6 of the latch from thesocket.

As the tool holder block is symmetrical, the latch can be insertedeither way round so that the tool can be used to cut in eitherdirection.

I claim:

l. A holder having a body formed with a socket for receiving a shankedtool and a resilient latch for retaining the shank in the socket,wherein the latch comprises a member having parts disposed on oppositesides of the socket and operatively connected by at least oneintermediate portion, at least one of which parts resiliently biases anopposite part towards and to lie at least partly in the socket, wherebyon inserting a shank into the socket said opposite part engages theshank so as to retain it in the socket, and resilient means beingdisposed between the said one part of the latch member and a portion ofthe body of the holder disposed between the socket and the said onepart.

2. A holder according to claim I, wherein the resilient member is ofelastomeric material and is arranged to surround a portion of theendless member.

3. A holder according to claim 1, wherein the body defines a cavity inwhich the resilient member is disposed.

4. A holder according to claim 1 wherein the latch member comprises anendless member mounted in the body to surround a shank in the socket.

5. A holder according to claim 4, wherein the body defines a recess inthe wall of the socket and surrounding the socket and in which theendless member is disposed.

6. A holder according to claim 5, wherein the recess in the body is inthe form of a slot extending through the body from one side to theother.

7. A holder according to claim 6, wherein the wall of the slot isdisposed at an angle to the normal to the longitudinal axis of thesocket.

8. A holder having a body defining a socket for re ceiving a shankedtool, comprising a recess in the wall of the socket and surrounding thesocket, an endless member received in the recess, a cavity communicatingwith the recess, a resilient member received in the cavity, the endlessmember and the resilient member together defining a resilient latch forretaining the shank in the socket and the resilient member resilientlybiasing a part of the endless member towards and to lie at least partlyin the socket, whereby on inserting a shank into the socket said partengages the shank so as to retain it in the socket.

9. A holder according to claim 8, wherein the endless member comprises alatching part, an oppositely disposed resiliently biased part and a pairof intermediate portions which join the two parts and wherein theresilient member is elastometric.

10. A holder having a body formed with a socket for receiving a shankedtool and a resilient latch for retaining the shank in the socket, thelatch comprising a generally rectangular loop member which is mounted inthe body to surround a shank in the socketwhereby limbs of the loop aredisposed on opposite sides of the socket and resilient means associatedwith an oppositely disposed pair of limbs of the loop member and biasingone of the limbs thereof to lie at least partly in the socket, wherebyon inserting a shank into the socket said one limb engages the shank soas to retain it in the socket.

11. A holder as claimed in claim 10, wherein the resilient meanscomprises elastomeric members disposed one on each of the oppositelydisposed pair of limbs.

12. A holder as claimed. in claim 11, wherein the elastomeric membersare cylindrical in form.

13. A holder as claimed in claim 11, wherein the elastomeric members aremoulded on the said pair of limbs.

14. A holder as claimed in claim 11, wherein the body defines cavitiesextending therethrough for receiving the elastomeric members one on eachside of the socket, the cavities being disposed transverse to the axisof the socket and transverse to the intended cutting direction of thetool, the body also being formed with a slot for accommodating the latchmember, which slot extends through the holder from side to side, theslot joining the cavities and intersecting the socket.

15. A holder as claimed in claim 10, wherein the resilient latchcomprises a pair of oppositely disposed fin- 6. gers arranged, in use,to project from opposite sides of the body, the'fingers providingsurfaces against which a lever can bear in order to displace the latchresiliently so that a tool shank can be inserted in, and removed from,the socket.

16. A holder as claimed in claim 15, comprising pro- I jections on thebody disposed forwardly of the fingers in the cutting direction of thetool, to shelter the fingers against contact with obstructions whichmight otherwise cause accidental unlocking of the latch, and also toprovide surfaces against which the lever can bear when removing andreplacing the tool.

1. A holder having a body formed with a socket for receiving a shankedtool and a resilient latch for retaining the shank in the socket,wherein the latch comprises a member having parts disposed on oppositesides of the socket and operatively connected by at least oneintermediate portion, at least one of which parts resiliently biases anopposite part towards and to lie at least partly in the socket, wherebyon inserting a shank into the socket said opposite part engages theshank so as to retain it in the socket, and resilient means beingdisposed between the said one part of the latch member and a portion ofthe body of the holder disposed between the socket and the said onepart.
 2. A holder according to claim 1, wherein the resilient member isof elastomeric material and is arranged to surround a portion of theendless member.
 3. A holder according to claim 1, wherein the bodydefines a cavity in which the resilient member is disposed.
 4. A holderaccording to claim 1 wherein the latch member comprises an endlessmember mounted in the body to surround a shank in the socket.
 5. Aholder according to claim 4, wherein the body defines a recess in thewall of the socket and surrounding the socket and in which the endlessmember is disposed.
 6. A holder according to claim 5, wherein the recessin the body is in the form of a slot extending through the body from oneside to the other.
 7. A holder according to claim 6, wherein the wall ofthe slot is disposed at an angle to the normal to the longitudinal axisof the socket.
 8. A holder having a body defining a socket for receivinga shanked tool, comprising a recess in the wall of the socket andsurrounding the socket, an endless member received in the recess, acavity communicating with the recess, a resilient member received in thecavity, the endless member and the resilient member together defining aresilient latch for retaining the shank in the socket and the resilientmember resiliently biasing a part of the endless member towards and tolie at least partly in the socket, whereby on inserting a shank into thesocket said part engages the shank so as to retain it in the socket. 9.A holder according to claim 8, wherein the endless member comprises alatching part, an oppositely disposed resiliently biased part and a pairof intermediate portions which join the two parts and wherein theresilient member is elastometric.
 10. A holder having a body formed witha socket for receiving a shanked tool and a resilient latch forretaining the shank in the socket, the latch comprising a generallyrectangular loop member which is mounted in the body to surround a shankin the socket whereby limbs of the loop are disposed on opposite sidesof the socket and resilient means associated with an oppositely disposedpair of limbs of the loop member and biasing one of the limbs thereof tolie at least partly in the socket, whereby on inserting a shank into thesocket said one limb engages the shank so as to retain it in the socket.11. A holder as claimed in claim 10, wherein the resilient meanscomprises elastomeric members disposed one on each of the oppositelydisposed pair of limbs.
 12. A holder as claimed in claim 11, wherein theelastomeric members are cylindrical in form.
 13. A holder as claimed inclaim 11, wherein the elastomeric members are moulded on the said pairof limbs.
 14. A holder as claimed in claim 11, wherein the body definescavities extending therethrough for receiving the elastomeric membersone on each side of the socket, the cavities being disposed transverseto the axis of the socket and transverse to the intended cuttingdirection of the tool, the body also being formed with a slot foraccommodating the latch member, which slot extends through the holderfrom side to side, the slot joining the cavities and intersecting thesocket.
 15. A holder as claimed in claim 10, wherein the resilient latchcomprises a pair of oppositely disposed fingers arranged, in use, toproject from opposite sides of the body, the fingers providing surfacesagainst which a lever can bear in order to displace the latchresiliently so that a tool shank can be inserted in, and removed from,the socket.
 16. A holder as claimed in claim 15, comprising projectionson the body disposed forwardly of the fingers in the cutting directionof the tool, to shelter the fingers against contact with obstructionswhich might otherwise cause accidental unlocking of the latch, and alsoto provide surfaces against which the lever can bear when removing andreplacing the tool.